O,o-dialkylthionophosphoric or o,o-dialkyldithiophosphoric esters of oxadiazoles

ABSTRACT

O,O-DIALKYLTHIONOPHOSPHORIC OR O,O-DIALKYLDITHIOPHOSPHORIC ESTERS OF ALKYL-1,3,4 OXADIAZOLES AND DI-(O,O-DIALKYLTHIONOPHORIC OR O,O-DIALKYLDITHIONOPHOSPHORIC ESTERS) OF 1,3-4-OXADIAZOLES HAVING A STRONG INSECTICIDAL AND ACARICIDAL ACTION, AND A PROCESS FOR CONTROLLING INSECTS AND MITES WITH THESE COMPOUNDS.

United States Patent 0,0-DIALKYLTHIONOPHOSPHORIC 0R 0,0-

DIALKYLDITHIOPHOSPHORIC ESTERS 0F OXADIAZOLES Heinrich Adolphi, Limburgerhof, Heinz Eilingsfeld,

Frankenthal, and Manfred Patsch, Ludwigshafen, Germany, assignors to Badisehe Anilin- & Soda-Fabrik Aktiengesellschaft, Ludwigshafen am Rhine, Rhineland- Pfalz, Germany No Drawing. Filed Aug. 19, 1970, Ser. No. 65,266 Claims priority, application Germany, Aug. 23, 1969, P 19 42 993.7 Int. Cl. C0711 85/54 US. Cl. 260-307 G 6 Claims ABSTRACT OF THE DISCLOSURE 0,0-dialkylthionophosphoric or 0,0-dialkyldithiophosphoric esters of alkyl-1,3,4 oxadiazoles and di-(0,0-dialkylthionophosphoric or 0,0-dialkyldithionophosphoric esters) of 1,3-4-oxadiazoles having a strong insecticidal and acaricidal action, and a process for controlling insects and mites with these compounds.

The present invention relates to new and valuable 0,0- dialkylthionophosphoric or 0,0-dialkyldithiophosphoric esters of oxadiazoles and to insecticides containing these compounds as active ingredients.

It is known to use substituted phosphoric esters having the formulae H I l (CHsO)eP-S-CH 001-13 as insecticidal active ingredients; however, their action is unsatisfactory.

We have now found that 0,0-dialkylthionophosphoric and or 0,0-dialkyldithiophosphoric esters of oxa diazoles having the formula X and R having the meanings given above, have a good insecticidal action. The action is particularly effective on mites and insects.

The new active ingredients may be prepared by reacting substituted oxadiazoles-1,3,4 having the formula Patented Jan. 16, 1973 ice RlO/ CHZCI where R denotes an alkyl radical having 1 to 5 carbon atoms or R denotes an aryl radical which may be substituted by halogen or nitro groups or R denotes the radical CH Cl, with the alkali metal salts of 0,0-dialkylthionophosphoric or 0,0-dialkyldithiophosphoric esters having the formula where R and X have the above meanings and A denotes the radical of an alkali metal (Na, K).

The reaction is preferably carried out in an organic solvent, e.g., acetone, tetrahydrofuran, methylene chloride, benzene, ethyl acetate, at temperatures of from 20? to C. It is possible to use both reactants in equimolar amounts or either of them in excess. Upon completion of the reaction, the common salt formed is filtered off from the mixture which is then concentrated. The new compounds are oily liquids which decompose easily at temperatures above 160 C. Their structure may be confirmed by nuclear resonance spectra.

The reparation of the new active ingredients is illustrated by the following examples.

EXAMPLE 1 S C lOJ -CH S-i (0 CHM NMR (CDCl;.;): 2.59 (8), 3.72 (D), 4.20 (D), 326:2.

EXAMPLE 2 10 parts of ch10romethyl-methyloxadiazole-1,3,4 and 17.8 parts of the sodium salt of 0,0-diethyldithophosphoric ester are heated in parts of acetone for 2 hours at 60 C. The common salt formed is filtered oil and the mother liquor concentrated. The yield is 23.2 parts of the compound S ll 0 O C3115 (3 NMR (CDCl 1.35 (T), 2.55 (S), -4.2 (M), 6:3:6.

EXAMPLE 3 Adopting the procedure of Example 1, 13.3 parts of chloromethyl-methyloxadiazole-1,3,4 is reacted with 23.6 parts of the sodium salt of 0,0 di-n-propyldithiophosphoric ester. There is isolated 32.0 parts of the compound NMS (d-DMSO): 0.9 (T), 2.6 (M), 2.5 (S), 4.0 (M), 6:4:316.

3 EXAMPLE 4 s 5 ll onaoni -a-mok j cm-s-r(on3):

NMR (CDCl;;): 3.7 (D), 4.2 (D), 6:2.

EXAMPLE 15 parts of bis-chloromethyloxadiazole-1,3,4 and 37.4 parts of the sodium salt of 0,0-diethyldithiophosphoric ester are stirred in 150 parts of acetone for 4 hours at 60 C. The precipitate formed is filtered oif and the filtrate concentrated in vacuo. The yield is 44.8 parts of the compound NMR (CDCl 1.4 (T), 4.1 (M), 1:1.

EXAMPLE 6 16.7 parts of bis-chloromethyloxadiazole-1,3-4 is dissolved in 200 parts of benzene; 40.6 parts of the ammonium-salt of 0,0-diethylthionophosphoric ester is then added to this mixture. After heating the whole for 5 hours at 60 C. the precipitate is filtered otf and the filtrate is concentrated in vacuo. The yield is 37.8 of the compound NMR (d-acetone): 1.35 (T), 4.22 (M), 1:1.

The agents according to the invention may be used as solutions, emulsions, suspensions or dusts. The form of application depends entirely on the purpose for which the agents are being used; in any case it should ensure a fine distribution of the active ingredient.

For the preparation of solutions to be sprayed direct, hydrocarbons having boiling points higher than 150 C., e.g. tetrahydronapthalene or alkylated naphthalenes, or organic liquids having boiling points higher than 150 C. and having one or more than one functional group, e.g. the keto group, the ether group, the ether group, the ester group orv the amide group, this group or these groups being attached as substituent(s) to a hydrocarbon chain or being a component of a heterocyclic ring, may be used as spray liquids.

Aqueous formulations may be prepared from emulsions concentrates, pastes or wettable powders by adding water. To prepare emulsions the ingredients as such or dissolved in a solvent may be homogenized in water or organic solvents by means of wetting or dispersing agents, e.g. polyethylene oxide adducts. Concentrates which are suitable for dilution with water may be prepared from active ingredient, emulsifying or dispersing agent and possibly solvent.

Dusts may be prepared by mixing or grinding the active ingredients with a solid carrier, e.g. kieselguhr, talc, clay or fertilizers.

The following known active ingredients are used in the bi g l comparati e xp riments:

CHaO g 0 P-s-cnn uv CHaO i O-CHa |l\ czHso O EXAMPLE 7 Action on two-spotted spider mite (Tetranychus telarius) Potted bean plants which have been heavily attacked by two-spotted spider mites are sprayed to run-01f with aqueous emulsions of the active ingredients listed below. The action is determined after 6 days. After this period an active ingredient should have eradicated any living larvae or adults of the two-spotted spider mite.

Concentration of the active ingredient in the emulsion Active ingredient: in percent by weight From Example 1 eifective 0.05

From Example 2 d0 0.05

From Example 4 do 0.05

From Example 6 do 0.01

II (for comparison purposes) ineffective 0.1

I (for comparison purposes) effective 0.1

EXAMPLE 8 Contact action on oriental cockroach (Blatta orientarlis) The inner surfaces of 1 liter glass vessels are wetted With an acetonic solution of the active ingredients listed below. After the solvent has evaporated, adult cockroaches (Blatta orienta'lis) are introduced into the vessels and the mortality is determined after 48 hours.

Amount of the active ingredient on the inner surface Active ingredient: of the glass vessel 70 parts by weight of the compound from Example 1 is mixed with 30 parts by weight of N-methyl-a-pyrrolidone. A mixture is obtained which is suitable for application in the form of very fine drops.

EXAMPLE 10 20 parts by weight of the compound from Example 2 is dissolved in a mixture consisting of parts by weight of xylene, 10 parts by weight of the adduct of 8 to 10 moles of ethylene oxide to 1 mole of oleic acid N-rnonoethanolamide, 5 parts by weight of the calcium salt of dodecylbenzenesulfonic acid, and 5 parts by weight of the adduct of 40 moles of ethylene oxide to 1 mole of castor oil. By pouring the solution into 100,000 parts by Weight of Water and uniformly distributing it therein, an aqueous dispersion is obtained containing 0.02% by weight of the active ingredient.

EXAMPLE 1 1 20 parts by Weight of the compound from Example 3 1s dissolved in a mixture consisting of 4.0 parts y We ght of cyclohexanone, 30 parts by Weight of isobutanol, 20 parts by weight of the adduct of 7 moles of ethylene oxide to 1 mole of isooctylphenol, and 10 parts by weight of the adduct of 40 moles of ethylene oxide to 1 mole of castor oil. By pouring the solution into 100,000 parts by weight of water and uniformly distributing it therein, an aqueous dispersion is obtained containing 0.02% by weight of the active ingredient.

EXAMPLE 12 EXAMPLE 13 20 parts by weight of the compound from Example 1 is well mixed with 3 parts by Weight of the sodium salt of diisobutyluaphthalene-a-sulfonic acid, 17 parts by weight of the sodium salt of a lignin-sulfonic acid obtained from a sulfite waste liquor, and 60 parts by weight of powdered silica gel, and triturated in a hammer mill. By uniformly distributing the mixture in 20,000 parts by weight of water, a spray liquid is obtained containing 0.1% by weight of the active ingredient.

EXAMPLE 14 3 parts by weight of the compound from Example 2 is intimately mixed with 97 parts by weight of particulate kaolin. A dust is obtained containing 3% by weight of the active ingredient.

EXAMPLE 15 30 parts by weight of the compound from Example 3 is intimately mixed with a mixture consisting of 92 parts by weight of powdered silica gel and 8 parts by weight of paraflin oil which has been sprayed onto the surface of this silica gel. A formulation of the active ingredient is obtained having good adherence.

We claim:

1. An 0,0-dialkylthionophosphoric or 0,0-dialkyldithiophosphoric ester of an oxadiazole having the formula io Lows-0 02 where R denotes a lower alkyl radical, X denotes oxygen or sulfur, and R denotes an alkyl radical having 1 to 5 carbon atoms, or R denotes the radical X and R having the meanings given above.

2. A compound of the formula wherein each R is an alkyl radical of from one to four carbon atoms, and R is an alkyl radical of from one to five carbon atoms.

3. A compound having the formula CHlQLCHz-S-fi (0 CH3):

4. A compound having the formula S CHglQJ-CHrS-i (O czHs):

5. A compound having the formula 6. A compound having the formula i L (CHaO)2P-S-HzC CHr-S-P (0 CH3):

References Cited UNITED STATES PATENTS 3,432,519 3/1969 Metivier et al. 260307 NICHOLAS S. RJZZO, Primary Examiner R. V. RUSH, Assistant Examiner US. Cl. X.R. 424272 

